Punch



March 16 1926. 1,576,681

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I find/2 Patented Mar. 16, 1926.

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' amputation fild Jilly 520, 1925. "Serial No. 441656.

Tamil-whom it may 'covwerna r Be rt known that I, Gnome HPSrnNoL-nn,

a citizen of. the United 1 States, residing at Rockford, in the county of Wi nneba'go "and 6 State of Illinois, have invented certain new and. useful improvements in Punches, *of

which the following is a'specification.

' This inventionrelates-to haaid punches of the lever type of the gei'ieral character described 'in' my earlier Patent No. 1,5105451 issued September 30, 1924; Inpunches'of this type the operating lever is normally maintained in cooperative relation to the punch operating part but the latter may be 1 swung out of operative relation to remove the punch when theoperati'ng lever is moved to an inoperative position.

The principal objectof the present invention' is to provide a simple and improved means for positively holding the operating lever in cooperative relation to the punch operating part by limiting the extent to which the operating lever may be moved toward an inoperative position, the said means consisting of a pin or bolt engaging a suitable stop, the pin or bolt being removable to permit the movement of the operating lever to an inoperative position so that the punch operating part may be swung to an inoperative position to remove the punch.

The construction which I have devised for accomplishing the above purpose does not operate in any manner to weaken the punch and is practical and durable for the character of work for which the punchis used. The construction is furthermore extremely simple and may be manufactured at a comparatively low cost.

The invention is fully described in the following detailed description which has reference to the accompanying drawing wherein Fig. 1 is a side view of a portable hand lever punch incorporating the improvement of my invention. similar view of the punch in o-pened position, one of the side links connecting the levers being removed more clearly to disclose my construction. In the two views the same reference numerals are applied tothe same parts.

The punch comprises a stationary handle 3 and a relatively movable handle 4 connect ed for relative pivotal movement by a pair of side links 5 and 6. Bolts 7 and 8 provide Fig. 2 1s a pivotal bearings in thehandles 3 and 4 re spectively. The handle 3 has an enlarged head 9 th'ereonj 'throitgh which the bolt 7 passes. Apair 0f jaws lt and-11 are formed integral with the head, the upper jaw '10 providing a bearing for afpunc'h or other cutting tool 12 while the lower jaw 11 provides a guide at 1-3 i'nthe fori'npf a die block into which the punch '12 may enter after through the work received between the jaws. The punch 12 has -its rear end slidably received in longitudinalguides inthe forwani end of punch reciprocating element 14. This element 141s pivoted at 15 'to the stationary handle 8 and has. a sec= tor portion 16 provided-"on its upper side meshing with a sector portion 1'71'011 the .inner'end'o'f the movable handle'l: The intermeshing of the sectors 16 and 17 provides. an operating connection between the handle 4 and the element 14 whereby the latter is given a slight pivotal movement to move the punch 12 in the punching operation when the handle 4 is closed down upon the handle 3. c

When the handle 4 is moved to the open position shown at Fig. 2 the element 14 is raised to retract the punch from the work by means of a pin or bolt 18 extending crosswise between the links 5 and 6, and slidably engaging the under side of the element 14 on a smooth surface 19 provided for the purpose. The surface 19 constitutes the base of a channel shaped notch formed in the element 14 so that a shoulder 20 is presented to the pin 18 when the lever 4 reaches the fully opened position shown in Fig. 2. Thus the opening movement of the handles is limited and the handle 4 is prevented from movement out of operative relation to the element 14. The pin or bolt 18 has a head 21 011 one end and threadingly receives a knurled nut 22 at its other end outside the links 5 and 6. When the nut 22 is removed the pin 18 may be withdrawn by grasping hold of the same at the headed end 21. With the pin 18 removed the handle 4 may 7 be moved past the position shown in Fig. 2 to an inoperative position in which the element 14 is free to be raised and swung in a clockwise direction to an inoperative position in the, course of which the punch 12 is removed from its bearing in the head 9. In this way one punch may be removed and another inserted. Obviously,' the construction is very simple and durable and the workman using the punch may quickly and easily remove and replace punches as he desires. The provision of the stop feature is of decided advantage in that the Workman in swinging the lever to open position does hot have to exercise care in the degree to which the lever is swung but can tell definitely when the pin engages the stop that the punch is fully retracted and another piece of work may be inserted.

I claim:

1. In a punch, a stationary handle, a movable handle, links pivotally connecting said handles, a tool having a bearing in the one end of said stationary handle for movement into and out of the work, a tool reciprocating element intermediate said handles and pivoted on the stationary handle, an operating connection between said movable handle and said tool reciprocating element to move said tool in the punching operation by bringing said handles to closed position, and a pin extending between said links behind said tool reciprocating element engaging a smooth surface provided thereon whereby to raise said element and retract the tool when said handles are moved apart, said element having a shoulder at the end of said surface to be engaged by said pin to serve as a stop to limit the opening of said handles.

2. In a punch, a stationary handle, a movable handle, links pivotally connecting said handles, a tool reciprocating in one end of said stationary handle for movement into and out of the work, a tool reciprocating member between said handles pivoted on the stationary handle, an operating gear element 011 the end of said movable handle, a toothed track therefor on the periphery of said tool operating member whereon said gear element operates to move said operating member on the working stroke in the swinging to closed position of said movable handle, a pin element extending between said links beneath said operating member, a smooth track on the under side of said operating member for said pin element to operate upon to raise said member on the tool retracting stroke of said movable handle, and a projection at the end of one of said tracks to be engaged by the element operating thereon to limit the tool retracting movement of said movable handle.

In witness of the foregoing I affix my signature.

GEORGE H SPENGLER. 

